Blender GPU rendering pcie x16 to x1 using riser cables
I was hoping someone had the answer to this question. My gut feeling is saying that it will work just fine rendering and blender through a 1x to 16x riser. I do think it will bottleneck just a little bit whenever it's sending the information to the GPU but I think it will be imperceptible for the most part. I have seen the GPU risers used in gaming and you do have a fairly significant drop in performance but I think that's due to what you said cuz there's two way communication that's constantly taking place. But with blender my understanding is blender Sims 2 textures and all that stuff and the mapping sing mapping to the GPU the cheap you calculate 2 and then sends the results back now granted it's doing that several times a second because it's doing in tiles and so forth but the two-way communication is nowhere near as rapid as it is in a gaming situation. Or at least that's my assumption. I do plan on trying that very thing out within the next couple months or so. My motherboard has 116 x lot and two 1X slots and I'm going to buy a 1x to 16x Riser and then hook my GTX 1060 to it and see what kind of drop of formats if there is a drop in performance there is. I'm going to bookmark this question and then come back and add more to it or leave another answer whenever I do this little test.